You are entirely normal. There are a ton of people who don't want children, that is why the birthrate is dropping in all modern countries. Having children, especially when you are younger and not well established financially can be devastating and force you into a life of poverty. Don't let anyone tell you that you have to have children. Some people think that humans are only on earth to work jobs and have children. That is ridiculous though. Your life is what you make it, and you can do anything you want with it. There is no set goal to life, you are free to decide on your own.

Plus there is already overpopulation problems. It isn't like humans are going to die out because you didn't have child. Also there is no real need to spread your genetic material into the future. If you think of how many people are related, your genes will get passed down no matter what happens to you. If you don't have a child your brother might, if he doesn't a cousin might. Someone in your family will, and if you go back like 4 or 5 generations, you could have hundreds of relatives you don't even know about.

Personally, I have decided that I wanted to wait until I am 100 years old before I have children. I have decided that by that time they should have sufficient technology available to make me live healthy forever, and technology to make having children easy. If they don't, then oh well. I am cool with never having children. I think by then I might be ready when I am 100.

I don't think you need to worry so much. I don't know how your mother is but if you tell her you don't want children she will probably think it is just a phase and that you might change your mind when you are older. You might, but I have not changed my mind about having children and now I am 30. I know people in their 50's who don't have children and they say they don't want children. I had a teacher in college once who was married, and his wife and him agreed that they would never have children because they didn't want to raise a children in the world as it was today.

The statics all show that people are having less and less children. The US population would actually be dropping right now if it wasn't for immigrants moving to the country. Which means out of the people born here, we are not having enough children to replace people who die. The world population is 7 billion at the moment. The world population could fall for the next 1000 years because people don't want children, and it isn't going to hurt the human race any.

Just ignore those people telling you that crazy stuff. The only valid reason to have a child is because you want one. If you don't want one, don't have one. Why do you think birth control exits? Because people don't want children.